Advantages
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Core Advantages
Your Humidity Control Expert
  • Technical Capability
    Specialized in the dehumidification industry for more than 20 years, PREAIR has accumulated 15 invention patents, 24 utility model patents and 5 software Copyrights. PREAIR has become the national research and development center of high and new technology. Leading in dehumidification industry technology.
  • R&D Team
    Our R&D team started to study dehumidification technology 30 years ago. Relying on the advanced Japanese technology introduced at that time, PREAIR had been focusing on the domain of deep dehumidification. In the past few decades, the R&D team has become stronger.

    At the same time, rely on the international market, cooperation with Fortune 500 companies in-depth, and collaborating with universities such as Zhejiang University and Central South University to overcome various technical problems in the domain of humidity control and provide professional solutions for humidity control in various industries.
  • Test Equipments
    PREAIR has the professional enthalpy-difference laboratory, comprehensive performance test room, product life test room, noise detection silent room, packaging and transportation laboratory, spray test laboratory, capillary flow test, air volume laboratory and water quality testing and other professional equipments.
Develope & Manufacture Humidity Control Products for 32+ Countries 

Development Section

A mass-produced PREAIR dehumidifier, in the development stage, it will go through 8000 hours of uninterrupted experimental testing, up to 120,000 times continuous testing for each component, which both are used to ensure the service life of the dehumidifier. Designated QC team will monitor the running program and check list of each components of the whole unit.
Customer just need to send us their customized drawings of the product and our R&D team will start project evaluation based on actual requirements. 
The developing process will normally take 4-6 months time of completion and a final sample unit will be sent to customer's hands for final testing and confirmation.
Instruments and Tools
Production of Dehumidifier

Production Section

In the produce section, all of the dehumidifier machine must be tested for the safety, performances and reliability. 
At PREAIR factory site, we have total 5 assembly lines which are all TUV approved, including 4 lines of commecial dehumidifiers and 1 line of industrial purpose dehumidifiers. At PREAIR factory, we have seperate procedure workshops, includs sheet-metal, rotomold housing, painting, laser cutting and punching. 
 
Production has total 320 employees, including 45 QC personnels.  Employees must attend 1.5 months of learning on each model's assembly or working SOP before they were allowed to the job position. Futher more, each month they will have to attend the random quiz of SOP and must re-study SOP again if found failure. 
We have 3 fully-automatic assembly lines out of total 5 with monthly production capacity reaches 20,000pcs of dehumidifier products. 
 
Five Steps of Quality Checking
1. Heat-exchanger (evaporator & condensor) water-dipping check - Leakage Issue
2. Cooling system water-dipping check (2.5MPa of air-pressure) - Leakage Issue
3. High and Low Electric Voltage check - Electric Safety Issue
4. Halogen Check - Cooling System Leakage Issue
5. Rolling and dropping check - Packaging Strength

Final Leakage Check

Before the dehumidifier products leave the factory, they have to go through 50 cycles of product sample testing.
Carry out physical and chemical tests such as salt spray and aging life mechanical properties.
Only after the 100% sampling inspection is passed can the final installation of sub-boxes be carried out. 
QC team will also use equipment to check inside the carton if feeble refrigerant leakage occurs (as refrigerant will accumulated inside the carton) to double ensure the leakage issue.
Leakage Check of Dehumidifiers
Zhejiang Preair Electrical Appliance Industry Co. Ltd.
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 E-mail: info@hzhongtai.com
  Tele: +86-13376814803
   Add: 2D-2, No. 63, Jiuhuan Road, Tech Park, Jianggan Dist., Hangzhou, Zhejiang, China.
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